Thank you. Yeah I have already tried that work around as well with the recalibrated Insta360 data and, while it helped in some ways, I'm still getting inconsistent vertical parallax issues on some but not all of the horizon at infinity. Manually finessing the vertical balance and ALL of the other controls hasn't allowed me to remove the vertical parallax on a few of the lens (it was shot on the Insta360 Pro). I have to think that the calibration data I'm giving Mistika isn't accurate and matching up to the footage. Perhaps it's because the camera wasn't stationary. I attached the camera to a moving bike so both me and the bike were always extremely close to the camera so when I used the method you mention above the data may have been thrown off with that being the case. Also because it is attached to a bike the scene is always changing a little bit as well as the reality that the camera had a very minor amount of horizontal sway back and fourth due to natural movement.
Could any of those things be throwing off the calibration? If so what can I do after the fact to give it the correct calibration data it needs? (see image for the vertical parallax issue on only part of the image)